diff options
| author | Srivatsa Vaddagiri <vatsa@codeaurora.org> | 2014-03-29 11:40:16 -0700 |
|---|---|---|
| committer | David Keitel <dkeitel@codeaurora.org> | 2016-03-23 19:58:53 -0700 |
| commit | 3967da2dd1f97b8d558207d8d720d699aca3d566 (patch) | |
| tree | 8ca85ed41c471a7d8e5a19b7e440499bddf7bc8b /include/linux/sched | |
| parent | e3fe80da05042802fc16f828919dfe3621a34d96 (diff) | |
sched: Window-based load stat improvements
Some tasks can have a sporadic load pattern such that they can suddenly
start running for longer intervals of time after running for shorter
durations. To recognize such sharp increase in tasks' demands, max
between the average of 5 window load samples and the most recent sample
is chosen as the task demand.
Make the window size (sched_ravg_window) configurable at boot up
time. To prevent users from setting inappropriate values for window
size, min and max limits are defined. As 'ravg' struct tracks load for
both real-time and non real-time tasks it is moved out of sched_entity
struct.
In order to prevent changing function signatures for move_tasks() and
move_one_task() per-cpu variables are defined to track the total load
moved. In case multiple tasks are selected to migrate in one load
balance operation, loads > 100 could be sent through migration notifiers.
Prevent this scenario by setting mnd.load to 100 in such cases.
Define wrapper functions to compute cpu demands for tasks and to change
rq->cumulative_runnable_avg.
Change-Id: I9abfbf3b5fe23ae615a6acd3db9580cfdeb515b4
Signed-off-by: Srivatsa Vaddagiri <vatsa@codeaurora.org>
Signed-off-by: Rohit Gupta <rohgup@codeaurora.org>
[rameezmustafa@codeaurora.org: Port to msm-3.18 and squash "dcf7256 sched:
window-stats: Fix overflow bug" into this patch.]
Signed-off-by: Syed Rameez Mustafa <rameezmustafa@codeaurora.org>
[joonwoop@codeaurora.org: fixed conflict in __migrate_task().]
Signed-off-by: Joonwoo Park <joonwoop@codeaurora.org>
Diffstat (limited to 'include/linux/sched')
| -rw-r--r-- | include/linux/sched/sysctl.h | 1 |
1 files changed, 0 insertions, 1 deletions
diff --git a/include/linux/sched/sysctl.h b/include/linux/sched/sysctl.h index 5ccdf9c4eb13..e301e64ec4e1 100644 --- a/include/linux/sched/sysctl.h +++ b/include/linux/sched/sysctl.h @@ -40,7 +40,6 @@ extern unsigned int sysctl_sched_min_granularity; extern unsigned int sysctl_sched_wakeup_granularity; extern unsigned int sysctl_sched_child_runs_first; extern unsigned int sysctl_sched_wake_to_idle; -extern unsigned int sysctl_sched_ravg_window; extern unsigned int sysctl_sched_wakeup_load_threshold; enum sched_tunable_scaling { |